Offers I’ve seen are $500 for 1/5 cost free royalty or $650 1/5 RI. You can ask for higher royalty or bonus, but you do need to make sure your lease actually does what you negotiate . Do you own surface? if so, any limitations you want on surface use? If cost-free royalty is negotiated, you need a gross proceeds clause. And so on. Remember the landman is not being paid to represent you, so seek your own legal counsel.